www.rohde-schwarz.com For more information:

pad

8 bit 8 bit 4 bit 9 bit

packet_type

superframe_idx rfupacket_

countt2mi_

stream_id payload_len

3 bit 16 bit

48 bit

T2-MI header crc32payload

pad_len bit 32 bitpayload_len bit

DVB-T2

(RF)

NTP/PPS/10 MHz

T2-MI

interfaceDEMUX

IA

Timestamp

TX

T2-MI via ASI or IP

Transmitter site (one or more sites)

TSn (audio/video)

L1 config

NTP/PPS/10 MHz

FEF config/data

AUX config/data

IA config

T2 gateway

T2-MI

interface

BB frame, PLPn

IA

AUX

Headend site

Mandatory

Timestamp

L1 signaling

FEFMUX

20-byte IP header 8-byte UDP header 12-byte RTP header n × TS packet

40 + n × 188 byte

Minimum packet format (IPv4) for RTP encapsulation

T2-MI packet ●●●●●●

TS packet

T2-MI packet

payload_unit_start_indicatorbit set

8-bit pointer to start ofnew T2-MI packet

4 bit

rfusubseconds

4 bit

bw

13 bit

utcoseconds_since_2000T2_timestamp 2016

27 bit40 bit8 bit 8 bit

frame_idx rfu L1-future_data 1116

variable

8 bit 8 bit

frame_idx rfu 1016

variable

L1-current_data

fef_idx rfu

3 bit

s1_field

4 bit

s2_field

9 bit8 bit

fef_idx rfu fef_part_data

variable

variable

3 bit

s1_field

4 bit

s2_field

9 bit8 bit

fef_idx rfu rfu2 num_subparts

32 bit 16 bit3 bit

s1_field

4 bit

s2_field

9 bit8 bit

fef_idx tx_identifier subpart_variety subpart_length subpartrfu2

16 bit 10 bit 10 bit32 bit

rfu1

16 bit

subpart_idx

9 bit8 bit

3016

3116

3216

3316

8 bit 8 bit 8 bit 7 bit

frame_idx plp_id intl_frame_start rfu BBFRAME 0016

K bchbit

fef_idx rfu fef_part_data

variable3 bit

s1_field

4 bit

s2_field

9 bit8 bit

frame_idx tx_identifier arbitrary_cell_data

variable18 bit

rfu

22 bit

start_cell_adress

16 bit8 bit

fef_idx rfu rfu2 num_subparts

32 bit 16 bit3 bit

s1_field

4 bit

s2_field

9 bit8 bit

0116

0216

1216

rfuindividual_adressing_length

individual_adressing_data 2116

variable8 bit8 bit

for i = 1…I { tx_identifier (16 bit) function_loop_length (8 bit) for f = 1…F{ function() (variable) }}

Rohde & Schwarz solutions for various DVB-T2 applications

Glossary:ASI = Asynchronous Serial Interface; BB = Baseband; CRC =  Cyclic  Redundancy Check; DTV =  Digital  Television; DVB-T2 =  Digital Video Broadcasting-Terrestrial; FEC  =  Forward Error Correction; FEF =  Future  Extension Frame; GPS =  Global Positioning System; HDTV = High Defi nition (HD) Television; MPEG =  Moving Picture Experts Group; NTP =  Network Time Protocol; PAD = Program Associated Data; PES =  Packetized Elementary Stream; PLP =  Physical Layer Pipe; PPS =  Positioning Per Second; PSI = Pro-gram  Specifi c  Information; RFU = Reserved for Future Use; RTP = Realtime Transport  Protocol; SFN = Single Frequency Network; SI = Service Information; T2-MI = T2  Modulator Inter-face; UDP = User Datagram Protocol; VCM =  Video Compres-sion Manager;

Rohde & Schwarz complies with the T2-MI standards. Monitor-ing of the T2-MI structure is defined in the TR 101290 measure-ment guidelines.Source: DVB Document A136 and A14-1

DVB-T2 transmitter feed

T2-MI protocol stack

The DVB-T2 standard allows different modulation parameters to be used for individual programs or groups of programs within a channel.

Programs/groups of programs are fed to the modulator as physical layer pipes (PLP). The associated modulation parameters are transmitted as L1 information. The T2 modulator interface (T2-MI) has been defi ned.

This serial interface (ASI or IP) enables time division multiplex (TDM) transmission of all channel data, including PLPs and L1 information.

T2-MI packet type Description0016 Baseband frame

0116 Auxiliary stream I/Q data

0216 Arbitrary cell insertion

1016 L1-current

1116 L1-future

1216 P2 bias balancing cells

2016 DVB-T2 timestamp

2116 Individual addressing

3016 FEF part: null

3116 FEF part: I/Q data

3216 FEF part:composite

3316 FEF subpart

all other values Reserved for future use

For network operators ❙ Transmitters ❙ Headends ❙ Monitoring devices ❙ Signal analyzers

For developers and manufacturers ❙ Signal generators ❙ Signal analyzers

T2-MI packetsAll data (BB frames, L1 data, SFN info, FEF and AuxData streams) is packetized as payload into T2-MI packets. In the T2-MI packet header, the packet_type gives the type of payload data, the payload_len fi eld the payload length in bits. Padding bits are used to align the subsequent CRC32 fi eld byte. The CRC32 and packet_count fi elds make it possible to verify error free transmission of the T2-MI packet.

DVB data piping (T2-MI specific) single PIDT2-MI packets are encapsulated into DVB/MPEG transport stream packets using “data piping” in line with EN 301 192 [4], clause 4. The T2-MI packets are inserted, one after another, into the payload of MPEG-2 TS packets. Each new T2-MI packet is to immediately follow the previous one. A TS packet may contain more than one T2-MI packet. T2-MI packets that are too big to fi t into the payload of a single TS packet are to be split across multiple TS packets as required. The fi rst byte of a T2-MI packet is signaled by the payload_unit_start_indicator bit in the transport_packet_header and, in this case, a pointer_fi eld is inserted after the trans-port_packet_header or adaptation_fi eld. The value of the pointer_fi eld gives the offset to the start of the fi rst T2-MI packet.

Timestamp (in line with TS-MI specifi cations)Used for SFN synchronizationT2-MI packet type: ❙ DVB-T2 timestamp = 2016

L1 signalingDVB-T2 setup configuration data (e.g. FEC, interleaver, modulation of different PLPs, T2-lite, T2-base, FEF)T2-MI packet type: ❙ L1-current = 1016

❙ L1-future = 1116

FEFAdditional frame structure to transmit other T2 profiles (e.g. T2-Lite)T2-MI packet type: ❙ FEF part: null = 3016

❙ FEF part: I/Q data = 3116

❙ FEF part: composite = 3216

❙ FEF subpart = 3316

BB frames, PLPn

Payload packed in BB frames and transmitted via PLPsT2-MI packet type: ❙ Baseband frame = 0016

AUXAdditional frame part within a T2 frame. Can be used to transmit e.g. I/Q dataT2-MI packet type: ❙ Auxiliary stream I/Q data = 0116

❙ Arbitrary cell insertion = 0216 ❙ P2 bias balancing cells = 1216

IAUsed for configuration of individual trans-mitters (e.g. MISO group)T2-MI packet type: ❙ Individual addressing = 2116

Transport streamT2-MI packets + null packets + optional PAT, PMT with T2MI_descriptor

IPEncapsulation of MPEG-2 TS in IP packets according to TS 102 034 clause 7.1.1

ASI8-bit/10-bit coding according to ETSI EN 50083-9.

or

R&S®AVHE100

R&S®ETL

R&S®BTC

R&S®DVMS4

R&S®THU9

T2-MI: Technical overview

T2-MI_po_en.indd 1 11.02.2015 16:44:26

Broadcast & Media

Poster | 02.00

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istered trademark of R

ohde & S

chwarz G

mbH

& C

o. KG

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es are trademarks of the ow

ners P

D 3606.7324.82 | V

ersion 02.00 | February 2015 (as) T2-M

I: Technical Overview

D

ata without tolerance lim

its is not binding | S

ubject to change

© 2013 - 2015 R

ohde & S

chwarz G

mbH

& C

o. KG

| 81671 Munich, G

ermany

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ou

t Roh

de &

Sch

warz

The Rohde &

Schw

arz electronics group is a leading

supplier of solutions in the fields of test and m

easurement, broadcast and

media, secure com

munications, cyber security, and radiom

onitoring

and radiolocation. Founded more than 80 years ag

o, this independent g

lobal company has an extensive sales netw

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stainab

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nergy efficiency and low

emissions

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al con

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iddle East | +

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de &

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mb

H &

Co. K

Gw

ww

.rohde-schwarz.com

T2-M

I: Te

chni

cal o

verv

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3216

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Rohd

e & S

chw

arz s

olut

ions

for v

ario

us D

VB-T

2 ap

plic

atio

ns

Glo

ssar

y:A

SI 

= A

sync

hron

ous

Ser

ial I

nter

face

; BB

 = B

aseb

and;

C

RC

 =  C

yclic

  Red

unda

ncy

Che

ck; D

TV

 =  D

igita

l  Tel

evis

ion;

D

VB

-T2

 =  D

igita

l Vid

eo B

road

cast

ing

-Ter

rest

rial;

FEC

 =  F

orw

ard

Err

or C

orre

ctio

n; F

EF 

=  F

utur

e  E

xten

sion

 Fra

me;

G

PS

 =  G

loba

l Pos

ition

ing

Sys

tem

; HD

TV

 = H

igh

Defi

niti

on

(HD

) Tel

evis

ion;

MP

EG

 =  M

ovin

g P

ictu

re E

xper

ts G

roup

; N

TP

 =  N

etw

ork

Tim

e P

roto

col;

PA

D =

 Pro

gra

m A

ssoc

iate

d D

ata;

PES

 =  P

acke

tized

Ele

men

tary

Str

eam

; PLP

 =  P

hysi

cal

Laye

r P

ipe;

PP

S =

  Pos

ition

ing

Per

Sec

ond;

PS

I =

 Pro

-g

ram

  Spe

cifi c

  Info

rmat

ion;

RFU

 = R

eser

ved

for

Futu

re U

se;

RTP

 = R

ealti

me 

Tran

spor

t  P

roto

col;

SFN

 = S

ing

le F

requ

ency

N

etw

ork;

SI 

= S

ervi

ce In

form

atio

n; T

2-M

I =

 T2 

Mod

ulat

or In

ter-

face

; UD

P =

 Use

r D

atag

ram

Pro

toco

l; V

CM

 =  V

ideo

Com

pres

-si

on M

anag

er;

Roh

de &

Sch

war

z co

mpl

ies

with

the

T2-

MI s

tand

ards

. Mon

itor-

ing

of

the

T2-M

I str

uctu

re is

def

ined

in t

he T

R 1

0129

0 m

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men

t g

uide

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umen

t A

136

and

A14

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DVB-

T2 tr

ansm

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feed

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ck

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DV

B-T

2 st

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llow

s di

ffer

ent

mod

ulat

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para

met

ers

to b

e us

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for

indi

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rog

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s or

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ups

of p

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a c

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ms/

gro

ups

of p

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s ar

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d to

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mod

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or a

s ph

ysic

al la

yer

pipe

s (P

LP).

The

asso

ciat

ed m

odul

atio

n pa

ram

eter

s ar

e tr

ansm

itted

as

L1

info

rmat

ion.

The

T2

mod

ulat

or in

terf

ace

(T2-

MI)

has

been

defi

ned

.

This

ser

ial i

nter

face

(AS

I or

IP) e

nabl

es t

ime

divi

sion

mul

tiple

x (T

DM

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l cha

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dat

a, in

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ket

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ll in

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ion

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nt

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e

1216

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bias

bal

anci

ng c

ells

2016

DV

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2 tim

esta

mp

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vidu

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l

3116

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part

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dat

a

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posi

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ther

val

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Res

erve

d fo

r fu

ture

use

For

net

work

op

erat

ors

❙Tr

ansm

itter

s ❙H

eade

nds

❙M

onito

ring

dev

ices

❙S

igna

l ana

lyze

rs

For

dev

elop

ers

and

man

ufa

ctu

rers

❙S

igna

l gen

erat

ors

❙S

igna

l ana

lyze

rs

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acke

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ll da

ta (B

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1 da

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s. In

the

T2-

MI p

acke

t he

ader

, the

pac

ket_

type

giv

es t

he t

ype

of p

aylo

ad d

ata,

the

pay

load

_len

fi el

d th

e pa

yloa

d le

ngth

in b

its. P

addi

ng b

its a

re u

sed

to a

lign

the

subs

eque

nt C

RC

32 fi

eld

byte

. The

CR

C32

and

pa

cket

_cou

nt fi

elds

mak

e it

poss

ible

to

verif

y er

ror

free

tra

nsm

issi

on o

f th

e T2

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acke

t.

DV

B d

ata

pip

ing

(T2-M

I sp

ecif

ic)

sin

gle

PID

T2-M

I pac

kets

are

enc

apsu

late

d in

to D

VB

/MP

EG

tra

nspo

rt s

trea

m p

acke

ts u

sing

“da

ta p

ipin

g”

in li

ne w

ith

EN

301

192

[4],

clau

se 4

. The

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acke

ts a

re in

sert

ed, o

ne a

fter

ano

ther

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o th

e pa

yloa

d of

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EG

-2 T

S

pack

ets.

Eac

h ne

w T

2-M

I pac

ket

is t

o im

med

iate

ly f

ollo

w t

he p

revi

ous

one.

A T

S p

acke

t m

ay c

onta

in m

ore

than

one

T2-

MI p

acke

t. T

2-M

I pac

kets

tha

t ar

e to

o bi

g t

o fi t

into

the

pay

load

of

a si

ngle

TS

pac

ket

are

to b

e sp

lit a

cros

s m

ultip

le T

S p

acke

ts a

s re

quire

d. T

he fi

rst

byte

of

a T2

-MI p

acke

t is

sig

nale

d by

the

pay

load

_uni

t_st

art_

indi

cato

r bi

t in

the

tra

nspo

rt_p

acke

t_he

ader

and

, in

this

cas

e, a

poi

nter

_fi e

ld is

inse

rted

aft

er t

he t

rans

-po

rt_p

acke

t_he

ader

or

adap

tatio

n_fi e

ld. T

he v

alue

of

the

poin

ter_

fi eld

giv

es t

he o

ffse

t to

the

sta

rt o

f th

e fi r

st

T2-M

I pac

ket.

Tim

esta

mp

(in

lin

e w

ith

TS

-MI

spec

ifi c

atio

ns)

Use

d f

or S

FN s

ynch

roni

zatio

nT2

-MI p

acke

t ty

pe:

❙D

VB

-T2

times

tam

p =

20 16

L1

sig

nal

ing

DV

B-T

2 se

tup

con

figur

atio

n d

ata

(e.g

. FE

C,

inte

rlea

ver,

mod

ulat

ion

of d

iffer

ent

PLP

s,

T2-li

te, T

2-b

ase,

FE

F)T2

-MI p

acke

t ty

pe:

❙L1

-cur

rent

= 1

0 16

❙L1

-fut

ure

= 1

1 16

FEF

Ad

diti

onal

fra

me

stru

ctur

e to

tra

nsm

it ot

her

T2

pro

files

(e.g

. T2-

Lite

)T2

-MI p

acke

t ty

pe:

❙FE

F pa

rt: n

ull =

30 16

❙FE

F pa

rt: I

/Q d

ata

= 3

1 16

❙FE

F pa

rt: c

ompo

site

= 3

2 16

❙FE

F su

bpar

t =

33 16

BB

fra

mes

, P

LP

n

Payl

oad

pac

ked

in B

B f

ram

es a

nd t

rans

mitt

ed v

ia

PLP

sT2

-MI p

acke

t ty

pe:

❙B

aseb

and

fram

e =

00 16

AU

XA

dd

ition

al f

ram

e p

art

with

in a

T2

fram

e.

Can

be

used

to

tran

smit

e.g

. I/Q

dat

aT2

-MI p

acke

t ty

pe:

❙A

uxili

ary

stre

am I/

Q d

ata

= 0

1 16

❙A

rbitr

ary

cell

inse

rtio

n =

02 16

❙P

2 bi

as b

alan

cing

cel

ls =

12 16

IA Use

d f

or c

onfig

urat

ion

of in

div

idua

l tra

ns-

mitt

ers

(e.g

. MIS

O g

roup

)T2

-MI p

acke

t ty

pe:

❙In

divi

dual

add

ress

ing

= 2

1 16

Tran

sport

str

eam

T2-M

I pac

kets

+ n

ull p

acke

ts +

opt

iona

l PA

T, P

MT

with

T2M

I_de

scrip

tor

IP Enc

apsu

latio

n of

MP

EG

-2 T

S in

IP p

acke

ts a

ccor

ding

to

TS 1

02 0

34 c

laus

e 7.

1.1

AS

I8-

bit/

10-b

it co

ding

acc

ordi

ng t

o E

TSI E

N 5

0083

-9.

or

R&

S®A

VH

E1

00

R&

S®E

TL

R&

S®B

TC

R&

S®D

VM

S4

R&

S®T

HU

9

T2-M

I: Te

chni

cal o

verv

iew

T2-M

I_po

_en_

3606

-732

4-82

.indd

1

29.0

1.20

15

18:1

6:11

T2-MI_po_en.indd 2 11.02.2015 16:44:28